"Manual" - Manually collected data that is sent to an external
lab for analysis (may no be collected daily). Mostly used for suspend particles collected by
pushing air through a filter which is later sent to a lab to be weighted

remove_extremes

whether to remove extreme values. For O3 all values above .2 are set to NA,
for PM10 those above 600, for PM2.5 above 175, for NO2 above .21, for SO2 above .2, and for CO
above 15. This is done so that the values match exactly those of the SINAICA website, but it is
recommended that you use a more complicated statistical procedure to remove outliers.

Value

data.frame with a column named value containing the air quality parameter values.
If the data was validated the column named date_validated will contain the validation
date. Care should be taken when working with hourly data since
each station has their own timezone (available in the stations_sinaica data.frame)
and some stations reported the timezome in which they are located erroneously.

Examples

# NOT RUN {## May take several secondsdf<-sinaica_param_data("O3", "2015-10-14", "2015-10-14")
head(df)
# }